Regenerative open-hearth furnace



LQSSS S. J. CCJRT ET AL REGENERATIVE OPEN HEARTH FURNACE Filed SeptA 24,1.925 3 Sheets-Sheet l Aug. Mr, w28.

INVENTORS Ya/@f2 Aug M, w28., ll

s. J. com ET AL.

REGENERATIVE OPEN HEARTH FURNACE Filed Sept. 24, 1925 5 Sheets-Sheet 2 mamig@ 25'. SWTTORNEYS S. J. CORT ET AL REGENERATIVE OPEN HEARTH FURNACEFiled Sept. 24, 1925 3 Sheets-Sheet 5 Q20 lIl,

STEWART J. conT, or B ETBLEHEM, rnifmsrnv;

NEW Yonx; AND ROBERT s. A. noUGHEBTY am) HEM, rENNsYLvANLA.

S E. LEER, 0F BETHLE- OPEN-HEABTH FUBNAOE. 1

Application lea September 24, 1925. Serial No. 58,268.

Our invention. relates .toY furnaces, l.and Fig. 9 is a horizontalsectional View taken more particularly to furnaces of the iegenalong theline IX-IX of Fig. 1; erat-ive open hearth type, and it has for an Figs.10, 11 and 12 are detail views shoW- 55 Object to provide an improvedWater cooled ing features of our improved water-cooled liner and damperstructure for the purpose throat liner; and,

of. prolonging the life thereof. Figs. 13 and'lll are detail andfragmentary In the construction of open hearth furviews of our improvedroof beam structure. naces, it lhas been proposed to provide theReferring now to the accompanying draw-V 60 ends thereof with resilientor monkey walls ings for a better understanding of our indefiningconverging diverging passages afvention, we show a furnace or meltingchamfording communicationbetween the furnace ber, .at 10, which iscomprised by the hearth chamber and the gas and air ports. In 11,parallel vside walls 12, converging end .order to better control afurnace ofthis AWalls 13, and an intermediate roof section 65 type,ithas beenJproposed to provide-damp- 14, and end chambers, at 15,comprised by? l5 ers ateach end thereof, a' damper being disbottoms1.46, converging side Walls 17 and posed at the throat of each oft-heconverging roof sections 18.' The side walls 13 and 17 diverginglpassages. Y Owing to the high at each end of the furnace converge inoptemperatures -of products of combustion Posite directions and areconnected'by the 70 passing through a converging diverging throats 19. V

passage, both the Walls thereof, as,well asY The end chambers 15 servein a wellits damper, are likely to be burned out. Aol known manuel' asmixing or combustion cordingly, therefore, it isan object of ourchambers, gas being supplied thereto by the invention to provide afurnace of this type gas upta e 20 and air being supplied thereto 75which shall have a water cooled beam strucby the air uptake 21.

`1:11115 extending horizontally `:icl-oss the top The efECVe area, f atllIOat 19 tffOId-v of the,` furnace and in the region of the ingcommunication .between the end chamthroat., this Structure beingprovided with a; bers 15 and the yfurnace Chamber 10 S Varied damperslot, through which is movablewa' 0r controlled by vmeans of atransversely 80 damper having a water-cooled rim, and the lmovabledamper "23, which is movable beam structure having secured theretoliners lll'Ollgll all Opening' in the 1 OOf 0f the ful" which areadapted to extend downwardly in nace by a Cable 24 passing over a sheave25, opposed relation t0 edges gf the damperv and the cable being"COIlleCted t0 any suitable to define Water-cooled sides for the passage.4Operating mechanism well-known vto those 35 These and other objects areaccomplished Y Skilled in the art and constituting no part by ourinvention as willbe apparent from of our present invention.

the Vfollowing description and the accom- The damper. illustrated iS ofa; type Old Pauying drawings, forming a pal-fof this m the art and itpreferably comprises a cenapplication, in which: j tralbody .or core ofrefractory material- 9o Fig. 1 is a fragmentary and longitudinalconsisting of brickwork 26 surrounded by a 0 sectional view 0f aful-'nagev embgdying fea- Water-cooled frame 27, the latter beingsupturcs of our invention; plied with a perforated tube 28 connectedFig. 2 is a transverse sectional view take to a source of compressed airand serving along theline III- II of Fig. 1; to stir up sediment intheframe 27. The 95 Fig. 3 is afragmentary plan view of the vframe isconnected by tubes 29 and 30 to a apparatus illustrated in Fig. 1; Ycross bar 31, the latter being attached to the Fig. 4 is asectionalfview of adamper; cable 24 already referred to. The tubes 29Fig. 5 is a transverse sectional'view 0f the and 30 also serve as outletconduits .for the damper rim; rims, such tubes being connected to a com-100 Fig. 6 isA adetail view of fastening'means mon conduit 32 and thelatter communicatso 'for securing the damper hood in place; ing by akhose connection 33V with aconduit 34 liigs.` 7 and 8` are detailviews of fasteiif leading to the exhaust collectorv 35. The ing means forythedamper hood cover; tuibe 29 has arranged therein a smaller tube duitsbeing 36 which communicateswith a flexible hose-- to 'the supplymanifold 39. AEach liner is provided with an outlet 48 at its upper endand the outlets are lconnected to discharge conduits 49, which lead tothe exhaust re Vceiver 35. V- y,

The lower ends of the liners 44 are-held Iin place in suitable recesses50 in the floor fit against shoulders 51 provided at the'side Wallsbefor bottom 16 and preferably tween transverse roof beams 53, to be moreparticularly hereinafter described. The liners are preferably providedwith laterally extending vertical spending vertical grooves in the beams53. From the structure described, it will be apparent that our improvedliners 44 are 'readily removable from the furnace, it being onlynecessary to-detac-h the conduit connections 47 and 49 and lift theliners upwardly. The pairs of` cooperating -beams 53 delinerdamperentrance spaces 56 for the dampers 23 and serve to support the roofsections 14 and 18 in a manner to be referred Each of the beam sections53 is preferably L-'shaped 'for the major portion of the length thereof'and ea'ch section is provided with water cooling conduit openings 57communicating with the manifold 39 and discharging to the exhaustreceiver 35, the conarranged near the surfacesof the beams which definethe damper entrance opening and near the bottom sides of the lbeamswhich are exposed to the heat of the furnace so as to effectively coolthe beams `and to oppose burning/out thereof due to the heat of thefurnace.

The beams 53 'are opposite and complementary in design so as to providethe damper entrance openings 56 a'nd jopposed vertical slots 55 toreceive the jtongues 54 ofthe liners. Outsidev of the liners, the beamsare provided with attaching portions V58 which are adapted to beattached by bolts or rivets 59 to opposed buckstays 60. The

beams 53 of a pair Amay furthermore beV secured together by suitablebolts or keys 61.

i 53 are arranged As illustrated, the pairs of beam members to extendtransversely of thefurnace above the throat portions 19 thereof, suchthroat portionsbeingprovided ribs 54' which fit corre.

' openings 72 alPP by opposed reentrant or monkey wallscomprised by theconverging wall portions 13 and 17. The buckstays 60 are arrangedexteriorly of the furnace and lit against the outside of the reentrantwalls and serve to reinforce the latter. In addition to the buckstays60, the furnace is alsoequipped with otherbuckstays 63 spaced widerapart for reinforcing the walls of the furnace.

The beam structures, comprised by the pairs of complementary beammembers 53 serve to divide' the' furnace roof into a plurality ofsections, whereby a section may be removed or repaired withoutdisturbing other sections. -Where the roof of the furnaceis a unitarypiece of masonry construction, Yit will be apparent that repairs andreplacements cannot be. localized to isolated sections but that theentire roof must generally be replaced. Our transverse beam structure,therefore, affords. a roof construction such that the end sections 18may be replaced or repaired without affecting the central section 14,and the latter section may be removed or repaired without affecting theend sections. As illustrated, the roof section l18 is inclined slightlydownwardly toward the furnace lateral thrust is imposed upon thetransverse beam structure. The transverse beam structures, therefore,not only serve to isolatethe roof into a plurality of sections but alsoserve to support or resist any lateral thrusts incident tothe design ofthe roof sections. l

In order to minimize theleakage of gases through .the space 56 andaround the damper 23, we provide a hood at 65, which extends above theroof of the furnace. and constitutes a pocket or receptacle forenclosing the damper when the latterV is elevated. The hood ispreferably comprised byv a metallic shell 66 which embraces refractorymaterial 67, the latter delining a damper ocket or receptacle 68. Theshell 66 is provided with flange means 69 at the bottom, the flangemeans 69 rest-ing on the beams 53 and being preferably secured to thelatter by detachable key means 70, such as illustrated in Fig. 6. Thekey means' referred to may be eomprised by bolts 71 which pass 'throughin the beam members 53 and registering openings 7 3` in the flange means69, the bolts being providedwvithV transverse slots to receive wedgekeys 73. From the structure described, 'it will, therefore, be arentthat the hoods 65'may be readily attached and detached from the beamstructures. f y r The shells 66 are preferably provided with anges 75near 'the tops upon which lit the top sections7 6, the latter beingnotched at 77 to receive L`vsliaped ke s 78 li 1n openings 79 in thellangesi 5 and` hel il place by transversely extending wedges 80 asshown in Fig. 8. The cover for the. hood chamber 10, whereby ispreferably madein complemental sections in order to provide for itsready attachment and removal. In removing the hood construction, thecomplemental parts 76 of a cover are first removed, then the damper iselevated up through the opening or pocket 68 and above the hoodstructure 65, whereupon the keys 70 may be removed and the hoodstructure taken off.

From the foregoing description, it will be apparent that ve haveprovided a furnace having reentrant monkey walls with watercooled orheat resisting liners in order t0 protect such. walls at points mostlikely to burn out. It will also be apparent that we have providedtransverse beam structures which are water-cooled, such beam structuresserving to define damper entrance openings, to divide the furnace roofinto a plurality of sections and to serve as tying means for opposedbuckstays 60, the latter cooperating to afford lateral support for thereentrant monkey walls. In addition, it will also be seen that weprovide a hood construction for the damper, whereby only openings forthe conduits 29 and 30 must be provided and the leakage of gas aroundthei damper to the outside is effectively limite While we have shown ourinvention in but one form, it will be obvious to those skilled in theart that it is not so limited, but is susceptible of various otherchanges and modifications without departing from the spirit thereof, andwe desire, therefore, that only such limitations shall be placedthereupon as are imposed by the prior art or as are specifically setforth in the appended claims.

Having thus described our invention, what we claim,1 as new and desireto secure by Letters Patent is:

1. In a regenerative furnace, in combination, a pair of opposedbuckstays, watercooled beams secured to opposite sides of the buckstays,and water-cooled members having key and slot connections with the beams.

2. In a regenerative furnace, in combination, a pair of opposedbuckst-ays, spaced water-cooled beams secured to the buckstays andhaving opposed vertical slots near each end, and water-cooled membershavin tongues at their upper ends fitting in the slots.

3. In a regenerative furnace, an arched roof structure comprising twomasonry sections and an intermediate section, said intermediate sectionincluding a water-cooled horizontal and transverse beam structure, andmeans maintaining said beam Structure in engagement with one -of saidmasonry sections in a manner to resist end movement of one masonrysection toward the intermediate section.

In a'regenerative furnace, an arched roof structure comprising twomasonry sections and an intermediate section, said intermediate sectionincluding a water-cooled horizontal and transverse beam structure, andmeans maintaining said beam structure in engagement with one of saidmasonry sections in a mannerto resist end movement of one masonrysection toward the intermediate section, said means including opposedbuckstays at opposite sides of the furnace attached to said transversebeam structure.

In testimony whereof I hereunto affix my signature this 21st day ofSept., 1925.

v STEWART J. CORT.

In testimony whereof I hereunto affix my signature this 4th day ofSeptember, 1925.

TIMOTHY BURNS.

In testimony whereof- I hereunto afiix my signature this 21st day ofSept., 1925.

ROBERT S. A. DOUGHERTY.

In testimony whereof I hereunto afiix my signature this 21st day ofSeptember, 1925 CHARLES E. LEHR.

